The lang/logo port makes use of the sgtty interface. We'd better let it
use the termios interface, because the first one will not work on
systems where COMPAT_43TTY is not present in the kernel. Because ucblogo
also has termio code, it isn't hard to port it to termios.

Fix: The following patch extends the existing patch to term.c to use the
existing termio code, ported to termios.

Please notice that even though the port will now use termios, it will
still give warnings during compilation about sgtty. Those warnings don't
matter, because they include sgtty.h in almost every file, only if it
exists (autoconf).